Rock drilling mechanism



June 1, 1937. E. G. GARTIN ROCK DRILLING MECHANISM Fild Feb. '7, 1935 2Sheets-Sheet l INVENTOR. .E'Zmer 6. aria'n. BY A) 4' W 1 A TTORNEY.

June 1, 1937. E. G. GARTIN nocx DRILLING MECHANISM Filed Feb. '7, 1935 2Sheets-Sheet 2 Patented June 1, 1937 UNITED STATES ROCK DRILLINGMECHANISM Elmer G. Gartin, Claremont, N. H., assignor to SullivanMachinery Company, a corporation of Massachusetts Application February'7, 1935, Serial No. 5,442

18 Claims.

My invention relates to rock drilling mechanisms, and more particularlyto rock drilling mechanisms of the type known as drifters.

An object of my invention is to provide an 5 improved rock drillingmechanism. Another object of my invention is to provide an improved rockdrilling mechanism having improved drill feeding and guiding means. Afurther object of my invention is to provide an improved feeding andguiding means for a rock drill of the mounted drifter type, providing avery compact construction. Still another object of my invention is toprovide a simple, inexpensive and efiicient rock drill feeding andguiding means for ad- 15 vancing the drill toward the work andretracting it therefrom under the control of a drill runner. Otherobjects and advantages of my invention will hereinafter more fullyappear.

In the accompanying drawings in which two embodiments of the inventionare shown for purposes of illustration,

Fig. 1 is a view in side elevation of a drilling mechanism constructedin accordance with the preferred embodiment of the invention;

Fig. 2 is a rear end view of the drilling mechanism shown in Fig. 1;

Fig. 3 is a view in longitudinal vertical section, on the plane of thesection line 3-3 of Fig. 4, through the feeding mechanism of theapparatus 30 shown in Fig. 1, but illustrates the drill proper largelyin elevation;

Fig. 4 is a vertical section on the plane of the section line 4-4 ofFig. 3;

Fig. 5 is a vertical transverse section on the plane of the line 5-5 ofFig. 3;

Fig. 6 is a fragmentary sectional view through the control valvemechanism taken on a plane corresponding to the line 9-6 of Fig. 4;

Fig. '7 is a view similar to Fig. 3, showing an- 40 other illustrativeembodiment of the invention;

Fig. 8 is an end view of the structure shown in Fig. 7;

Fig. 9 is a vertical section on the plane of the section line 9-9 ofFig. '7;

Fig. 10 is a transverse vertical sectional view on the plane of the lineIll-l9 of Fig. 7.

Referring to the drawings and first to Figs. 1 to 6 thereof, it will benoted that a rock drilling motor I adapted for the actuation of a usual50 drill steel 2, is supported for guided feeding movements by a feedingand guiding mechanism generally designated 3. The feeding and guidingmechanism 3 is supported by a trunnion 4 which provides a pair ofupstanding spaced ear por- 55 tions 5, between which there is receivedthe depending narrow rib portion 6 of a feed cylinder structuregenerally designated i. The rib 6 is transversed by a series of holes 8through which, and through corresponding holes 9, 9 in the ears 5,holding bolts [0 are inserted to permit the disposition of the feedcylinder and its supported parts in different longitudinal relativepositions with respect to the trunnion 4. Feed cylinder 1 includes thehollow body portion ll providing a bore l2 and rigidly attached as bywelding or the like to the rib 8, a rear head I3 and a forward head I4,the latter traversed by a suitable opening l5 for the passage of apiston rod. Within the cylinder there is reciprocable a piston I!provided with oppositely facing cup leathers l8 and suitably attached asat H! to a piston rod 29. The piston rod is traversed by suitablelongitudinal passages 2| and 22, later again referred to, andrespectively opening at 23 at the forward side of the piston and at 24at the rear side thereof. A suitable guide and drill support structuregenerally designated 25 and cylindrical in outline except for the factthat it is slotted, as at 26, longitudinally to provide a narrow slothaving walls 21 and 28 spaced sufficiently to receive between them theupmost portions of the ears 5, surrounds and slides upon the exterior ofthe cylinder member 1. This guide structure is provided with a rigidlyconnected forward head 39 in which is secured at 3| the front end of thepiston rod 2|. Upon the top of the member 25 there is provided as at 33a seat 34 upon which by suitable clamp devices 35 there is rigidlyclamped a base portion 36 secured to the drilling motor I. Within therear head 31 of the drilling motor is arranged a valve chest 38 in whicha valve 39 is rotatably supported. This valve is hollow as at 49 andreceives motive fluid from a fluid-conducting member 4|. The valve istraversed by a pair of fluid supply ports 42, 43, passage 42 terminatingin a circumferential groove 44 of substantial extent to permit.adjustment of the valve 39 through a relatively wide angle to controlmotive fluid supply to the drill in a well-known manner through portmeans not shown, so that forward feed can be suitably maintained duringcontrolled drilling motor operation. The valve is also provided with apair of peripheral arcuate grooves 46 and 41 by means of which, indifferent positions of the valve, exhaust or vent ports 48 and 49 may beselectively placed in communication with the passages 59 and 5| whichrun downward into communication with longitudinally extending passages52 and 53, which communicate respectively With the passages 22 and 25 inthe piston rod. The built-up construction at 33 provides with the headportion 38 adequate rigidity for the walls of the guide structure 25,but obviously peripheral ribs could be applied if greater stiffness wererequired.

The mode of operation of this device will be readily understood from theforegoing description. It will be noted that in the position of theparts shown in Figs. 2 and 3, the chamber 40 is supplying fluid throughpassage 43 and passages 53, and El and port 23 to the forward face ofthe feed piston, and therefore the drill is being moved in rearwarddirection. It will be noted, moreover, that when forward feed is desiredthe throttle valve 39 may be moved under the control of its operatinghandle H to bring the groove 44 into communication with the passage 59and to bring the groove ill into communication with the passage 5!; thenfluid will flow from the interior of the valve through '52, M, 58, 52,and 22 behind the feed piston, and will feed the latter and the guidestructure 25 and the drilling motor I forward in an obvious manner, thedrilling structure being maintained against lateral displacement, andwith the drilling motor moving in alinement with the hole by thecooperation of the shoulders El, 28 with the tops of the ears 5. It willbe evident that this structure is simple, and very compact, and that thedrill may be fed forward a considerable distance while still fullysupported and guided; and that the parts are inexpensive, durable andeasily constructed.

Referring now to the construction shown in Figs. 7 to inclusive, it willbe noted that in this casethe drilling motor 5 which actuates the drillsteel 2 and which is controlled by a suitable throttle mechanism 39, ofwhich the drill controlling portions are not illustrated in View oftheir well known nature, is mounted upon a supporting and guidingstructure 56 which comprises an approximately cylindrical feed cylinderportion 55 and a portion 5% connected at 5'! to the portion 55. Theportion 56 is relatively narrow and comprises a pair of gib portions 58which cooperate with guides 59 formed integrally with and extendingsubstantially throughout the full length of a cylindrical guide member60. The throttle valve mechanism 39' corresponds substantially inconstruction with the controlling valve 39 of the first illustrativeembodiment of the invention and controls the communication of vents 68,49, and of fluid supply ports 45 and 43' with passages 50, 5!. Thepassages 50, 5| communicate with longitudinally extending passages GI,62 formed in the portion 56 and communicate at their forward ends withupright passages (ill and 5 and the passages 64 and 63 respectivelycommunicate through a longitudinal passage 65 and a radial passage 66with the rear end of the bore of the feed cylinder 55 and through alongitudinal port 67 with the forward end of said feed cylinder. Thefeed cylinder 55 is provided with a bore 69 which receives a stationaryfeed piston 70 having suitable cup packings ll, l2 and mounted at theend of a piston rod 13. The piston rod 13 extends through a suitablypacked opening "M in the rear head of the cylinder 55 and is connectedto a head it: which is connected in any suitable manner, as shown bythreads ll, to the guide Ell. The guide 69 is supported and suitablysecured to a trunnion member Hi, there being provided in the member 60 alongitudinal slot 19, and in the trunnion member 18 in alinement withthe slot :19 a longl tudinal opening 80 so that a depending key portion8! formed upon the lower surface of the cylinder member 55 may bereceived and guided in the trunnion and in the slot 19. This key portionclosely fitting the slot '19, and longitudinal opening 8U maintains thedrilling motor in a uniform path of travel during feeding. The mode ofoperation of this devi e will be clearly apparent. It will be noted thatin it the feed cylinder 55 slides inside the guide member Gil instead ofthe guide sliding upon the outside of the feed cylinder, as in the firstillustrative embodiment. It will be observed that when fluid is admittedthrough the passage 35 and port 66 under the control of the throttleapparatus til, the pressure will act within the space to the right ofthe feed piston ill and cause the feed cylinder 55 and the drillingmotor 5' to be retracted. When, however, fluid flows from groove Mthrough passages til, 63 and port 6? into the space at the left-handside of the feed piston ill, the drilling motor will be fed forward andeffect a drilling operation.

With this form of construction also, it will be observed that a simple,effective, inexpensive feeding apparatus is provided, Well adapted forthe functions it has to perform. 1

While there are in this application specifically described two formswhich the invention may assume in practice, it will be understood thatthese forms of the same are shown for purposes of illustration and thatthe invention may be further modified and embodied in various otherforms without departing from its spirit or the scope of the appendedclaims.

What I claim as new and desire to secure by Letters Patent is:

1. In a rock drilling apparatus, in combination, a rock drill, andpressure fluid operated feeding and retracting and guiding means forsaid drill comprising a single feed cylinder member, a piston therein, acylindrical member having a longitudinal slot therein, said cylindermember providing a projection interfitting within said slot, and saidpiston and cylinder member being relatively reciprocable, and saidcylinder member and cylindrical member being coaxial and relativelyreciprocable with their adjacent arcuate surfaces in sliding, guidingcontact, means for holding one of said members stationary, and aconnection between the rock drill and the other of said members.

2. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill comprising a pair oftelescopically arranged cylindrical members having widely extendedarcuate surface contact with each other and one having a projectinglongitudinally extending guide portion and the other providing portionslaterally engaging said projecting portion, one 01" said membersconstituting a double acting feed cylinder operative to effect selectivefeeding and retraction, means for holding one of said membersstationary, and operative connections between the drill and the other ofsaid members.

3. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill comprising a single feedcylinder member, a piston therein, a cylindrical member having alongitudinal slot therein and of an internal diameter to fit in slidingrelation with said cylinder member, said cylinder member providing aprojection interfitting Within said slot, and said piston and cylindermember being relatively reciprocable, and said cylinder member andcylindrical member relatively reciprocable, means for holding one ofsaid members stationary, and a connection between the rock drill and theother of said members, said rock drill disposed substantially whollybetween the ends of said lastmentioned member.

4. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill comprising a pair oftelescopically arranged cylindrical members one having a projectinglongitudinally extending guide portion and the other providing portionslaterally engaging said projecting portion, one ofsaid membersconstituting a double acting feed cylinder operative to effect selectivefeeding and retraction, means for holding one of said membersstationary, and operative connections between the drill and the other ofsaid members, said drill disposed substantially wholly to the rear ofthe forward end of said last-mentioned member.

5. In a drilling apparatus, in combination, a drilling motor, a slottedcylindrical member connected to said drilling motor, a stationary feedcylinder in telescoping relation with said slotted cylindrical memberand having a support extending through said slot, a piston in said feedcylinder, means for admitting feeding pressure selectively at oppositesides of said piston, and a piston rod connecting said piston with saidslotted cylindrical member.

6. In a drilling apparatus, in combination, a drilling motor, a slottedcylindrical member connected to said drilling motor, said motor andcylindrical member arranged in laterally offset side by side relation, astationary feed cylinder in telescoping relation with said slottedcylindrical member and having a support extending through said slot, apiston in said feed cylinder, means for admitting feeding pressureselectively at opposite sides of said piston, and a piston rodconmeeting said piston with said slotted cylindrical member.

'7. In a drilling apparatus, in combination, a drilling motor, a feedcylinder connected to said drilling motor, a stationary slottedcylindrical member in telescoping relation with said feed cylinder, saidfeed cylinder having a portion slidable within said slot, a piston insaid feed cylinder, and a piston rod connecting said piston with saidslotted cylindrical member.

8. In a drilling apparatus, in combination, a drilling motor, a feedcylinder connected to said drilling motor, said motor and cylinderarranged in laterally offset side by side relation, a stationary slottedcylindrical member in telescoping relation with said feed cylinder, saidfeed cylinder having a portion slidable within said slot, a piston insaid feed cylinder, and a piston rod connecting said piston with saidslotted cylindrical member.

9. In a drilling apparatus, in combination, a drilling motor, andfeeding and guiding means for said motor including telescopicallyarranged members having thereon provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, means for supplying operating fluidselectively at opposite sides of said piston to effect feeding orretraction at will, a piston rod connecting said piston With the otherof said members, means for holding one of said members stationary, andmeans for connecting the drilling motor to the other of said members.

10. In a drilling apparatus, in combination, a drilling motor, andfeeding and guiding means for said motor including telescopicallyarranged members having thereon provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, a piston rod connecting said piston with theother of said members, means for supplying operating fluid selectivelyat opposite sides of said piston to effect feeding or retraction atwill, said means including passage forming means in said piston rod,means for holding one of said members stationary, and means forconnecting the drilling motor to the other of said members in laterallyoifset side by side relation thereto.

11. In a drilling apparatus, in combination, a drilling motor, andfeeding and guiding means for said motor including telescopicallyarranged members having provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, a piston rod connecting said piston with theother of said members, means for supplying operating fluid selectivelyat opposite sides of said piston to effect feeding or retraction atwill, means for holding the feed cylinder member stationary, and meansfor connecting the drilling motor to the other of said members.

12. In a drilling apparatus, in combination, a drilling motor, andfeeding and guiding means for said motor including telscopicallyarranged members having provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, a piston rod connecting said piston with theother of said members, means for supplying operating fluid selectivelyat opposite sides of said piston to effect feeding or retraction atwill, said means including passage forming means in said piston rod,means for holding the feed cylinder member stationary, and means forconnecting the drilling motor to the other of said members in laterallyoffset, side by side relation thereto.

13. In a drilling apparatus, in combination, a drilling motor, andfeeding and. guiding means for said motor including telescopicallyarranged members having provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, a piston rod connecting said piston with theother of said members, means for holding said last mentioned memberstationary, and means for connecting the drilling motor to the said feedcylinder member.

14. In a drilling apparatus, in combination, a drilling motor, andfeeding and guiding means for said motor including telescopicallyarranged members having provision for precluding their relativerotation, one of said members being a feed cylinder, a feed piston insaid feed cylinder member, a piston rod connecting said piston with theother of said members, means for holding said last mentioned memberstationary, and means for connecting the drilling motor to the said feedcylinder member in laterally offset, side by side relation thereto.

15. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill including a single feedcylinder member, a feed piston in said cylinder member, said cylindermember and feed piston being relatively reciprocable, a cylindricalmember telescopically arranged in guiding relation with said feedcylinder member, said cylindrical member having a longitudinal slottherein, and a key portion on said cylinder member having a relativelyslidable engagement with said slot for preventing relative rotationbetween said membars.

16. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill including a feed cylindermember, a feed piston in said cylinder member, said cylinder member andfeed piston being relatively reciprocable, a cylindrical membertelescopically arranged in guiding relation with said feed cy1- indermember, said cylindrical member having a longitudinal slot therein, akey portion on said cylinder member having a relatively slidableengagement with said slot for preventing relative rotation between saidmembers, said key and slot connection constituting the sole means formaintaining the parts against relative rotation, means for holding oneof said members stationary, and a connection between the other of saidmembers and the rock drill.

1'7. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill comprising a cylinder member, apiston therein, a cylindrical member having a longitudinal slot therein,said piston and cylinder member being relatively reciprocable, a keyportion on said cylinder member having a relatively slidable engagementwith said slot, said cylinder member and cylindrical member beingrelatively reciprocable, means for holding one of said membersstationary, a connection between the rock drill and the other of saidmembers, and means including controlling valve means carried by saidrock drill and passages leading therefrom to the spaces at the oppositesides of said piston for selectively efiecting feeding and retraction.

18. In a rock drilling apparatus, in combination, a rock drill, andfeeding and guiding means for said drill comprising a pair oftelescopically arranged cylindrical members one having a projectinglongitudinally extending guide portion and the other providing portionslaterally engaging said projecting portion, one of said membersconstituting a feed cylinder, a feed piston in said feed cylinder,operative connections between the other of said members and said feedpiston, means for holding one of said members stationary, operativeconnections between the drill and the other of said members, and meansincluding controlling valve means carried by said rock drill andpassages leading therefrom to the spaces in the feed cylinder at theopposite sides of said feed piston for selectively efiecting feeding andretraction.

ELMER G. GARTIN.

